Reenforced-concrete beam



Aug. 21, w23.

R.C.KEOGAN REENFORCED CONCETE BEAM Filed Nov. 29, 1920 `INVENTOR- ATTORNEY.

Patented Aug. El, ll923 RICHARD C. KEOGAN, SOUTH BEND, LIIDL'ANA.

nnnNionoEn-oononnrn snare.

`Application filed November 29, 1.920. Serial No. 2/,1.30.

.To all lwhom it may concern.' Y

Be it known that I, Richard) C. KEOGAN, a citizen or" the UnitedStates, residing'at South Bend, in the county ot" St. Joseph and State ot indiana, have invented certain new and usefulY improvements in lleenforced-Concrete Beams, oit which the tollowing is a specification. The invention relates to concrete beams and has for its object to provide a device of this character which may be made ot considerable length and so reent'orced that the beam will stand a maximum load centrally without sagging appreciably or cracking.

A further object is to provide a concrete beam substantially rectangular shaped in cross section and of greater vertical thickness centrally and tapering toward the ends. Also to provide reinforcing means for said beams, said reinforcing means comprising reinforcing metallic bars imbedded in the beam adjacent vit-s upper and lower faces and equally spaced from said upper and lower faces having their ends provided with angled portions for anchoring the ends of the metallic bars within the beam.

A further object is to provide a spirallywound metallic member extending around the reinforcing bars and tied to said bars,

ing means for preventing outward spreading ot' the metallic bars when the beam is supported by its ends and supporting a load.

A further object is to provide adjacent the lower face of the beam longitudinally disposed truss rods, the ends'oi" which eX- tend upwardly and outwardly and terminate in angle portions adjacent the angled portions ot' the upper reinforcing rods, thereby supporting the central load of the beam and allowing the concrete beam of considerablelength to be used.

With the above and other objects in view the invention resides in the combination and arrangement of parts' as hereinafter set forth, shown in the drawings, described and claimed, it being understood that changes in the precise embodiment of the invention may be made within the scope of what is claimed without departing from the spirit ot the invention.

In the drawings Figure l is a side eievation et the beam,-

said spirally wound metallic member torm-V showing thc reinforcement therein in dotted lines'. Figure 2 is a. vertical sectional View taken on line L2 of Figure l."

i' liigure Slis' arletail perspective View ot a portion ot the reinforcing bars and the spiral metallic winding thereon.

Referring to the drawings the numeral l designates a beam termed from plastic ma terial, preferably concrete and Q the ends thereof which are adapted to rest upon supporting columns. The beam l is thicker at a central point 3 than at its ends 2 however it tapers toward the ends 2, thereby giving greater central strength for supporting a load. Extending longitudinally through the beam l adjacent itsfundeiI face lare spaced reenforced rods 5, the ends ot said rods are provided with angled porw tions 6, which form anchoring means for anchoring the ends of the rods 5 and preventing longitudinal movement of said rods. Imbedded in the beam l adjacent its upper faces 7 and equally spaced therefrom are reinforcing rods 8, said rods extending downwardly from their central portion and terminating adjacent the ends of the beam in right angled portions 9 which form means tor anchoring the ends ot said rods against longitudinal movement when the beam is supporting a load.

To prevent buckling 4inwardly or outw wardlv or' the rods 5 and 8, said rods have spirally wound around the same a metallic strap 10, which is tied by metallic clips ll to the rods 5 and S wherever the strap engages the rods 5 and S. Then the beam is supporting a load, it will be seen that the sides l0 ot the strap will hold the reinforcing rods 5 and 8 against inward or outward. buckling, thereby allowing the beam to support a considerable load. As a further brace for the beam reinforcing truss rods l2 are imbedded in the beam adjacent its lower side 4, said truss rods having their ends extending upwardly and out wardly and terminating in angled portions 13 adjacent the angled portions 9 of the reinforcing rods S, thereby distributing the strain from a central point to points ad jacent the ends of the beam.

it has been found that a beam so constructed can be made ot considerable length. for instance a beam 52 :feet in length and supported only at its ends has been found to support a load of seven tons, the maximum sag at its center approximating one halt' inch. During this test breaks or Cracks Y did not appear in the concrete body.

It so desired eye bolts 14; may be imbedded in the beam so that the same may be easily being imbedded in a concrete body adjacent the bottom thereof, spaced reinforcing bars imbedded in the concrete body adjacent the upper side thereof andidispo'sed in registering vertical planes with the irst mentioned bars, said bars adj aeent the upper side of the concrete body extending downwardly and outwardly YfromV a Vcentral point7 a member A wound` aroundall of said bars, said member comprising a plurality of straight portions, said straight portions connecting the bars together at angles other than right angles.

In testimony whereof my signature.

RICHARD e. Knoeaa. 

